United States Patent (113,573,581 72 Inventors John J
United States Patent (113,573,581 72 Inventors John J. Dutko 3,268,047 8/1966 Grygera, et al............... 1121219 North Plainfield; 3,374,410 3/1968 Cronquist, et al............ 3181138 Richard Beck, Morris Plains; Henry A. 3,435,314 5/1969 Bradley........................ 318/138 Seesselberg, South Plainfield, N.J. 3,443,181 6/1969 Tozol, et al................... 318/138 (21) Appl. No. 836,103 3,466,517 9/1969. Leenhouts.................... 318/138 22 Filed June 24, 1969 45 Patented Apr. 6, 1971 Primary Examiner-Oris L. Rader (73) Assignee The Singer Company Assistant Examiner-K. L. Crosson New York, N.Y. Attorneys-Marshall J. Breen and Chester A. William, Jr. 54 SYSTEM FOR CONTROLLING NEEDLE POSITONING DRIVE AND THREADTRMMING FUNCTIONS OF AN INDUSTRIAL SEWNG ABSTRACT: Solid-state digital logic circuitry with gates, MACHINEDRIVEN BY A CONTNUOUSLY memory flip-flops, delay and sensor elements provide a logic COUPLEDDCMOTOR system for controlling the drive and braking currents to a DC 10 Claims, 9 Drawing Figs. motor continuously coupled in driving relation to a sewing machine. In response to certain input commands, a series of (52) U.S.Ch....................................................... 318/266, events are signaled by the logic circuitry to occur automati 12/219,3181466 cally in a predetermined time sequence resulting in a desired 51 int. Cl............................... ......................... H02p3/06 output sewing related function. Silicon controlled rectifiers 50 Field of Search............................................ 112/219; (SCR's) are used to supply driving current to the motor from a 318/265,266, 466 polyphase voltage supply. A single SCR is used to supply Ref Cited dynamic braking current for the motor.
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